Optical diffuser



FIG. 1 is a front perspective view of an optical diffuser according to the invention.

FIG. 2 is a front elevation view of an optical diffuser according to the invention.

FIG. 3 is a top plan view of an optical diffuser according to the invention.

FIG. 4 is a bottom plan view of an optical diffuser according to the invention; and,

FIG. 5 is a front perspective view of an optical diffuser according to the invention as it may be used atop a light emitting diode (LED) light bulb base with heat sink.

Items shown in broken lines are for illustrative purposes only and form no part of the claimed invention. 

CLAIM We claim the ornamental design for an optical diffuser, as shown and described. 